BEIRUT - Gunmen stormed a pro-government Syrian TV channel headquarters on Wednesday, bombing buildings and shooting dead three employees, state media said, in one of the boldest attacks yet on a symbol of the authoritarian state. President Bashar al-Assad declared late on Tuesday that his country was "at war". U.S. intelligence officials said the Syrian regime was "holding fairly firm" and digging in for a long struggle against rebel forces who are getting stronger. ...